Another question, which NASA has been almost puritanically prudish about, is sexual relationships in space. Cramped conditions, lack of privacy, and just plain awkwardness has limited the chances of such occurrences so far, but as extended space flights become more common and more people become astronauts, this will change. After all, there really isn’t that much to do on long duration space flights to Mars or the outer planets, let alone on a starship careening at a significant fraction of C to another star.

Astronauts are people, after all, not super human demi-gods who are above the failings and desires of mere mortals. Astronauts can get spacesick, become bored, fall for another astronaut, and have likes and dislikes like anyone else. Mission planning has to take that into account or risk problems on a long spaceflight.